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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '331113a9fad0d82dd60fa779dc2479b598786e3f4e50f2e490e396918b2793ab' 
  AND token = 'cpjmYgLXyC6R0QGddg7J3ZsQLdsPjc88PDz6PuWJymM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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