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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f72fc60d555622e55717baa5c84d42b49b066ae2ba8a16222f3cfc2067126025' 
  AND token = 'blBhroUMYQEdaZiC2p8QtU3mZI93LFCgogsPTUNDGs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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