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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2a4b9eef2b30629e79262862bbcdc9ff9fe7283eb3ef7f8eb0bdbd37e627676' 
  AND token = '+62zGDS5QR1/aLqAjGDPGoOzJdcy1Q0EiAwIjDflNTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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