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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79540bc7b4e08fed07be28f4128728e55082143012f70865fdedfba72f363787' 
  AND token = '3gn//b1GLfFOh+PRBYFX89Nq070e0g5+gE5nWiuH79U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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