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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3317800273cb93ba492185322312d5f61ee0b6501f244060da8c4326c49493d3' 
  AND token = 'L8PWSkrpECxD8pJ0ZvhcRKpDM9vDYrmnvZIdUMOWA1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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