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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ce5106ac3db5656fe9e09f2fb24fce552f079d6930c391eb259e48d030ecc56' 
  AND token = 'lG2r2Xv12KPTfw7jbDAzPpdqzr8HbjOc2dxDzjdzpH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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