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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8058c9204617db28ca48d515a2d45226711e5371586e6b4c168ca96145ada8e' 
  AND token = 'jcbya7UOc0CiYSCcGjLji7ZX7kJJCRUe0iIPoV3rxf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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