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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db82348a90e213215a75f63b9b15dc833cab26fc0f9a417f5c8b384cf4cc81b6' 
  AND token = 'dG2jmbosk62YupTym9/VrVI/ST9cti97c2vLb+e/ino=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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