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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e68de52b2d0494169589aeed90b75a37487620b5b2dad115decc87434f7f2322' 
  AND token = 'fnFEXH6V4OcqRxz20S13VQkQj7w5p8lDo36J8i460ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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