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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e70802d8eec2b4cd7bb7500038b2f57a16dae0e1b91f80b5eee10b42832ae7f' 
  AND token = '+6yUisvsv8qWectNFS0WYvR6EqMFbq+CFVkFpVyBRBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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