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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '917239ecb4f6ff8e5b4db69d9cc4681be9d982e631116fb12525638c7fea3c20' 
  AND token = '2OOlQy6P3ueVm/sRtvK1DPimfUfkuAovU3URxOR1FBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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