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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cd9cfeee2bb04bb2d7631b83a5b74d605b95436b63b2051e4d60aadabfb83bf' 
  AND token = 'nJsyDXCJGG31350kQsYGJ1ecqwI77fWS9yl4wurl0Qs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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