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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a574eea8124486007c77861ccf11b1ffddb04b5de6281a2bd239559cb60f0db3' 
  AND token = 'k5jOFrXBcVbe75bYTSn5dNrejwV7DoaXeUlaHHmx+58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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