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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '661fe88211d1d6004d3f1d205b5169339cb0be4603deb368d485067c0a7786a6' 
  AND token = 'XTYf+V10VGmE6dKlcHlgbpRUx/soc0E2E+A9cEdq1t8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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