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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd757405e748ae94a36ba8ae7ca4412a1400e80cc3dd7a07ef244b5eb3445df3d' 
  AND token = '7sKDZfK2C+nLmUNaWAenuVN+M6OMxFpCnqz+PhDRYW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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