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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a65ec9f4c18046cc1b1b28c9d0e74ff40872af20477d3c14c68fcfee4ea2cf25' 
  AND token = '1SqQrbXZ3+x+3WarypQVjmbAJngIBIsrybsjE43PeYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}