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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f53ab3e56f9832d7111d9150f950a80c1de150af860f1b069e551de2ba28c61' 
  AND token = 'NWutIwZFtI4iPze196AjVHXMf6ucGgruY514xw8Fl9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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