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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57e5297b9fbc75bc1e9fbf6fa47153935c87f01cc81680ab8c450fd54b54aca0' 
  AND token = 'OJ81aOlw4BrSMrr6CT8wmwmM5RdW3iq2u0gaOeoQVTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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