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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a771671f0fe8de9d3f604d43d0c39036e4accad50892a17e2c0eb0ea3ad309dd' 
  AND token = 'C95wWanuwQRSbm5OAxBObpV7D2wKJrihfRPLrTSRqMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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