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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bc800169b4ce5b41b1c724d8bc9bef0ca4f38317ade013b90c140db7ec148b8' 
  AND token = 'YQafcR2XlUTaEWdzU4hnxRPRuI3L/h2XmFGz2hJtNww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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