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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d5c3ad4bbe603a62b8094d9b7a61089a6df8819d5862e1a30783130ef9c1686' 
  AND token = '/kK++ZBHMkowrQd9/ggoIu6n9xS0jx0fgzKibDcDv4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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