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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fa6b11516df96ea939b6b44aa6f9f3b15c584e97063a6a16e1461fc9d031cf7' 
  AND token = 'p5crv31qRarm3wnAH7gOo5s5GrmrgwxHyKzBxNvuTBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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