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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '322c3f5b015986d0b4330220309ca6b7439e814e66b893bc95988857e4cccd92' 
  AND token = 'sdnOpsn29BcfOiw6I0Tq7EuRjr9VVY5vkwEl1n+uNeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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