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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ecc41c7fd4d04465c313ca7441b4c03ae0e10e3cb813eca14042a972dbfefa9' 
  AND token = 'l27Iq1j4mmuvQfkkImNuqIZYoGutOqv4Xshsld0m8Hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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