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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81a97ae2b3e7cff392cc414a20377b5201c27f50a71c24497744f5f9286a5abd' 
  AND token = 'Rch3a/oSWGdvMIVv1PNfwzfvcxMCQZe/MhhW75Z1lUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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