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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ae12afc21ef89e987d90010ca39037ea4c68e60f1c60aa1ff68913a42356a16' 
  AND token = 'SEAyAfJr9k3JARYwYGkDYDodE7McA9+r7sZM9VEKEN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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