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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9de50e53a22621f829455f9de50c665940be562660329a8458fbbee1d046695' 
  AND token = '7KfHWHq0I/NQv1zqG8xiG3a4YBDvktKeVJ5xeQC+w5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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