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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa1a49efbefe964641ff3eb66de3481b038ee98408cd1729525461fd6cde5702' 
  AND token = 'p0n5+IYpr9FwYZfxkBFcr8bTetk5mOgcMYoXgN88uJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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