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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7369ccb1c567e031a05a6d55c15135ba9b85a1bb5f8afe4890aa87441ffcb9d' 
  AND token = 'sYzYhlGwkLqLYInJ0iQ82FmMtVsCEd8I+o7hud2Se5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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