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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '202d4be61f67a8fa0ac46ea154934527f8bd92b92a6efac93ce572384bf18dd5' 
  AND token = 'zxk3IIHg5xdDxTbSe0W4aaIKpr4NZ2c/7KXa4Xt7ZoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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