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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfe9f3e0cfd4906431f6a171d4a09bf422e37b929668c9f98ca752213cfafd05' 
  AND token = 'GuxG3RXfSyr5JStNSM4pkDIjLjBfLNHr7Jvvv89EGiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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