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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be6822c092ec16268c5054c093730e32a9f210b36bc39ee8c25ab07574c4ac2c' 
  AND token = 'tDLtU//6Gl7WQuBl9pfsuJ2E1kStlSSqaVxmpYpakps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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