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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f64f740eaaa6ccd061798177e819b1e8ffcbe05f1eb70c1ba1e28d063528a39b' 
  AND token = 'RDrSXTxbJrhifB2uVa1ZDr2ikUcSx7ICJ/HIIO7G7Ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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