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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fb3533a32c83d9ab1c7ceb55c1f8ccc32705c7d3a70ce2b33113630a6e34718' 
  AND token = 'NFpCC7Ys4RSj3i8QajfiJ/Tk+V3Bp0Ada4b/2mOlfVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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