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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e4c1c8db32e4fa7333c46221fc67df2142ab458c9ab203504a4c770d56ba60b' 
  AND token = 'OzAj29n1fLSAvHzVyOcdXsLZBXzMpWuXY3jXz8S4Bbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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