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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89351d85efe96bb4015b63a527cfd9eddcfeddb722c12339301c773708ba5021' 
  AND token = '2nqb0cHmrnYX8R4TKZ/ZJ54B5hQOeuoh/e4sPGigftA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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