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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f987b180786a1800519092d2d5076720c6412b3b0ea196e29f2b070cfa6e9cb' 
  AND token = 'fbP7pYr9Y7clhsHOh1wxo50V69LTApbqqUbyJ3V/zGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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