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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6819d5d00267fae39561b7ac002bc1c1128ccb0fabb42fe6efa10daf0a95b772' 
  AND token = 'BIvbV+pF+pman1YeNK0XXCxVqorsMXxFb038ioJWtD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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