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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35820f932826c60c34303d8a0eb815ea33cc44402406bc8ab6d296a2095d5d41' 
  AND token = 'fpaYGfdtflMDqwLxIQBl2ExOv5T0j6PTuu8wp6iR+98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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