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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b7ddc7c28252951dbd59f0b58637b2074dbac8d9c5bb32165bcce2f2e788bc0' 
  AND token = 'm3MJKwoCGVhGIt34q8NLTMtyjr1ggda+8Hu8S9Z0330=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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