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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96e8c24946fbb06f75271f465a23df968ebd904a8d594957c8b8c6277ebcf51f' 
  AND token = 'cFv3Ued3FX454eg/Y2E2HS4qIECiFdAQ4JB8Av5Lwg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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