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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e31c3afe724f3238e7a176f8ff7f80532366c4c37e139559eabfe363cd5ca57' 
  AND token = 'MOfX+WDSvHgfVIIpmnxbLr2Wcn9VWUSPIahIixP/mZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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