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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb5a11b43f6e9e204f2e976bc341c050ea0aaa7d49228b6a9bc0ca80276c1b61' 
  AND token = 'A3WFftYodfPGw8GfbxjkedFbEIklcIEwaV84jDu4edM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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