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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c56cb2c42ca42b2cb90d695814d809cf8a9ef9d11d7314f4a69ce765c92e9b20' 
  AND token = 'dCUEkBl54SoYxX94ZF8MVmndk5wlpK26CM26R6dk5Zw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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