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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eee8d6482bdd2e632e1af3fa9c4ab72aaf8937957eab1b0a55d8c7ba46a1a75f' 
  AND token = '/P/fT7QixHJFjQd7KGkH21lBGj+6wmrMjTz34cU2Gfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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