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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f958b96c42fe69c2af4ab0d8230b9055db35a8a4918c28cd0cfeec4364980519' 
  AND token = '5Kp44z775ow5Rdop3XfZHXp2LGdEehz9ZNk1Sz6XZzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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