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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f1a9a923ed68abe76eff7262debc894428ff64fa72176c49c7634694269683b' 
  AND token = 'vYghs/dLA8AemJmIFoACnbLG7Nqf3qMTgEKdSW/cOs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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