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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '647f3f9d3576b888be329c816cd3ca485766c616676d933020c91a62ca90dce5' 
  AND token = 'WZrqeI/+6MZlRNGgrBLgNfu4tX+I45YQ+fyR39QOXFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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