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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e03770134e053234ce062cdc79523581bde109f67c754ebcc7c6ec68bf079bd3' 
  AND token = 'Z4QGoJU/UTNK4sQB6jt4nbdipReNeWcqv67wkyTt7MY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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