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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5acc17073a041892a941999b965f19b5174b35e5077102ed24c4070a47e2b21b' 
  AND token = 'mKXtYrTsyx+98CFu71rBV1ilt/SCG7Xkgoc0fckqXMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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