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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e5adb857bcc55728502352be589fe19f7f4919d15e48ba7377b66f4cb6b7131' 
  AND token = '7+CzhymongDEFIqLI78kU4aL/egUTLyuLS8RNJqneuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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