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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea737f447402e156882a3388302ed36b1c79780b9360cc62f6c468f08ea71602' 
  AND token = 'N8aoxliebubi6bTY4Xoy9OH73m9SfL9VP9I+R/N6R/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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