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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14d016e8bf327b0c884dfbd6042b136f117d692b3ae0ef25e6347f1de1bbd78d' 
  AND token = 'yKQ3p1J8mnH0yoLO54ALZuvVxFsdg7nM5TRCCaTnFnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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