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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61ecbc626c8002ced62e6677a64cff94978214f43372d0350bd87f5184eca38d' 
  AND token = '4zKAkvhw0+A2+bfcFZZeLb6B6yz1wSzuWKCP6paItmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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